Authors: Richard B Brugam
Publish Date: 1981/04/01
Volume: 80, Issue: 1, Pages: 47-62
Abstract
The water chemistry of 28 lakes from both sides of the border between glacial drifts of the Grantsburg lobe high CaC03 and Superior lobe low CaCO3 in eastcentral Minnesota was examined to determine if drift type influences lakewater chemistry Similar analyses were performed on groundwater samples taken from wells near each lake Concentrations of Ca++ Mg++ HC0 inf3 sup SO inf4 sup were significantly higher in lakes of the Grantsburg lobe whereas K+ Si02 and HCO 3 were significantly higher in samples of groundwater from the Grantsburg lobe There was no correlation between groundwater concentrations of particular ions and lakewater concentrations of the same ions implying that the sources of dissolved ions in lake water are shallow groundwater and soil leachates rather than the deeper groundwater sampled here Na+ and Cl concentrations in some lakes appear to be strongly influenced by the use of deicing salt on highways in winter rather than by differences in drift lithology
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